Sulfonate-Based Triazine Multiple-Electron Anolyte for Aqueous Organic Flow Batteries

Area of Science:

• Electrochemistry
• Materials Science
• Organic Synthesis

Background:

• Development of advanced materials for energy storage is crucial.
• Triazine derivatives offer potential for electrochemical applications due to their redox properties.

Purpose of the Study:

• To synthesize and characterize a new highly soluble triazine derivative, (SPr)4TpyTz.
• To evaluate its electrochemical performance for electron storage.
• To investigate the factors affecting its stability and efficiency.

Main Methods:

• Efficient, low-cost synthesis of (SPr)4TpyTz.
• Concentrated single cell tests.
• Density Functional Theory (DFT) studies.
• Electrochemical performance evaluation (kinetics, diffusion, efficiencies).

Main Results:

• (SPr)4TpyTz exhibits three reversible redox processes with fast kinetics and high diffusion coefficients.
• Reduced species tend to aggregate, but this can be mitigated by electrolyte concentration tuning.
• Stable two-electron storage with excellent efficiencies was achieved under optimal conditions.
• Higher electron storage or concentration led to capacity decay and pH increase, suggesting irreversible protonation.

Conclusions:

• The synthesized triazine derivative (SPr)4TpyTz is a promising candidate for high-performance energy storage.
• Controlling aggregation through electrolyte concentration is key to maximizing stability and efficiency.
• Understanding the protonation mechanism is important for further optimization.